Booster seat



FIG. 1 is a perspective view of a booster seat showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a right-hand side elevation view thereof, the elevation view of the left-hand side being a mirror image of the right-hand side elevation view;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The mechanical features of the booster seat are shown in broken lines for illustrative purposes only and do not form a part of the present invention. 

The ornamental design for a booster seat, as shown and described. 